Click image to enlarge.

Sextant

Catalogue number:
2004.0054.01

Inscriptions:
"David White Co. Milwaukee, Wis." and "U.S. NAVY, BU. NAV. MARK II"

Dimensions:
radius 6.5 inches

Discussion:
This type of sextant was introduced during World War II. The limb is graduated to single degrees. A drum micrometer, the teeth of which mesh with teeth cut into the edge of the limb, reads to 1 minute and, with vernier, to 6 seconds of arc.

Ref: Benjamin Dutton, Navigation and Nautical Astronomy (Annapolis, Md., 1948), pp. 347-355.

Further Information:

White, D.
Sextant